Answer : 3. "Karnataka"
Explanation :

Recently, the Hoysala temples of Karnataka have been included in the UNESCO World Heritage Site.

1. These temples belong to the 12th and 13th centuries.

2. These are excellent examples of South Indian architecture.

3. These temples have intricate carvings and sculptures on the walls and ceilings.

4. UNESCO has described these temples as "representing a unique style of Indian temple architecture".

5. The inclusion of these temples is expected to boost the cultural heritage of India.